It's most likely an Oncidium, as mentioned in the comment above. I can't find an image of one with this exact coloration, but it is actually quite difficult to see detail in the pictures you provided, they do not magnify well. Image of one that's similar (with care information) here http://www.guide-to-houseplants.com/oncidium-orchid.html - scroll down and compare detail of the photo shown with your own plant, since it's not possible to see that sort of detail in your pictures.
UPDATE: Now you've posted a close up pic, it confirms your orchid as an Oncidium. This link shows one similar (first pic, third row) https://www.alamy.com/stock-photo/brown-and-yellow-orchid.html but, if you click on it, you will be able to see clearly the internal structure of the flower, which is almost exactly like yours. Unable to establish precisely which cultivar of Oncidium though.
It might be a cross breed between Oncidium and Miltonia (although still referred to as Oncidium) - see information in this thread http://everything-orchids.com/types-of-orchids/oncidium-orchid